How many points does the perspective in the viewport use and is it changeable?
I'm no architect, but this should only depend on your camera alignment.

1 point perspective - camera aligned to 2 axis
2 point perspective - camera aligned to 1 axis
3 point perspective - camera not aligned to any axis

As given in the link in the comment and mentioned by  @haarigertroll mathematically these are special  cases of the one point perspective.